Film cameras are still incredibly cheap. I bought a Fuji GA645 back when the camera first came out. It was $1600. Today you can get good examples for $400. That is dirt cheap for such a world class camera.
Stil in the $400 whereabouts? Back in 2014 I browsed around for MF and ended up picking the GW690 but if one thing Fuji laid out well is the complmentarity of these cameras. The GA being a superconvenient "half frame" medium format vs the 6x9 RF Behemoth. Anyways, prices for the GA hovered that mark.
Pentax 67 has doubled. Sweet 105 and wooden grip, babies!
"Instagram"? Some internet role models which are capable of setting the "pace" to others who are too lazy to think on their own or to comprehensively compare two machines and make a decision.
More or less but also depends of the people. I tend to dive into things and research a lot before commiting to anything. Most people may just search "buy first film camera" see the AE1, a few others and there you go. AE1's and K1000 AFAIK soared because they have become the "go to" novice cameras.
Then the Yashica 124G, I've seen it hyped quite a bit lately. IDK about prices, but I got a user Rolleicord V which is more of a classic for a decent price and less than what most 124s were going for last year.
Then the Contaxes and mjuII, well, I'm agreeing more with you. Saw a catalog scan from a decade ago and the price new listed at B&H was about half of what they are selling now. SLR wise, I got a Nikon F90 which are cheapish (in US: cheap!) and seem hard to kill. Unsexy 90s styling, no F4 caché but lighter, yuck. Great battle camera.
Nowadays I use the rationale of better spend the $ on film and gas (not GAS, what a pun), which is to go places, than cameras. Whenever I got some slack in budget I should fix up my OM1 and tune up that Rolleicord. I should buy more Provia/Velvia soon and support E6.